B and D is out. It cant be A because heat of combustion is substance not compound. So the answer is D.
Answer:
C
Explanation:
Alleles being more minute than genes,can pass on trait similar or different
Answer:
Uranium-238 undergoes alpha decay to form Thorium-234 as daughter product.
Explanation:
Alpha decay is indicative of loss of the equivalents of a helium particle emission. The reaction equation for this reaction is shown below:
→ 
I hope this explanation is clear and explanatory.
SI unit of frequency is Hertz(Hz)